/* 清除浮动 */
.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}
.clearfix:after{
    clear: both;
}

.pointer {
    cursor: pointer;
}

.mask {
    position: fixed;
    left: 0;
    top:0;
    z-index: 9;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}



